The effect of gas density on the work of breathing in man. Sam-TR-66-22.
D001274:Atmospheric Pressure; D006371:Helium; D006801:Humans; D008297:Male; D009584:Nitrogen; D010100:Oxygen; D012119:Respiration / Q000502:physiology*
D006371:Helium; D009584:Nitrogen; D010100:Oxygen